Carbamazepine (Tegretol) and Ketamine Therapy | Tovani Health
Tegretol (Carbamazepine) (also: Carbatrol, Equetro) — Anticonvulsant / mood stabilizer (potent CYP3A4 inducer)
Verdict at Tovani Health
Strong CYP3A4 induction can lower ketamine levels meaningfully; we plan around it.
Carbamazepine is a potent CYP3A4 inducer, and ketamine is metabolized primarily by CYP3A4 and CYP2B6. The pharmacokinetic interaction is real: patients on stable carbamazepine therapy may need higher ketamine doses to achieve the same effect, and response may still be more modest. We evaluate case-by-case rather than turn patients away or pretend the interaction does not exist.
If you take Tegretol regularly and are considering at-home ketamine therapy, the combination is depends on your specific situation. This page covers the brief pharmacologic context and what we do at intake.
How Tegretol interacts with ketamine
Carbamazepine strongly induces CYP3A4 (and several other CYP enzymes). Ketamine clearance increases on chronic carbamazepine, lowering plasma levels at any given dose. This is distinct from a sedation or QT interaction; the issue is reduced drug exposure.
What we do at intake
Disclose dose, duration of therapy, and the indication (seizure, bipolar, trigeminal neuralgia). Stopping carbamazepine for KAP is not appropriate without your prescriber's involvement. We may start with the same dose protocol and titrate up sooner if response is muted.
Bottom line
Carbamazepine is a potent CYP3A4 inducer, and ketamine is metabolized primarily by CYP3A4 and CYP2B6. The pharmacokinetic interaction is real: patients on stable carbamazepine therapy may need higher ketamine doses to achieve the same effect, and response may still be more modest. We evaluate case-by-case rather than turn patients away or pretend the interaction does not exist.
Frequently Asked Questions
Will I just need a higher dose of ketamine to compensate?
Possibly. The exact magnitude varies by patient and is not well-quantified for KAP. We discuss the trade-offs honestly during your eligibility call.
Can I stop carbamazepine for the duration of KAP?
Not unilaterally. Carbamazepine is usually being used to prevent something significant (seizures, mood episodes, trigeminal pain). That conversation happens with your prescriber, not us.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on Tegretol (Carbamazepine) at intake. The eligibility check takes 5 minutes and gives you an honest answer about whether at-home ketamine fits your specific situation.
FL and NJ residents only. Benjamin Soffer, DO — Tovani Health.
Sources
The verdict and clinical guidance on this page are based on the following peer-reviewed literature and FDA prescribing information.
- Ketamine: Pro or antiepileptic agent? A systematic review. Shehata IM, et al.. Heliyon. 2024. PMID: 38293492
Systematic review of ketamine's seizure-modulating effects (mostly antiepileptic in standard doses).
- Ketamine: A Review of Clinical Pharmacokinetics and Pharmacodynamics in Anesthesia and Pain Therapy. Peltoniemi MA, Hagelberg NM, Olkkola KT, Saari TI.. Clinical Pharmacokinetics. 2016. PMID: 27028535
Comprehensive clinical pharmacokinetics/pharmacodynamics review of ketamine including CYP-mediated drug interactions (CYP3A4, CYP2B6).
Clinically reviewed
Reviewed by Benjamin Soffer, DO on May 15, 2026. Dr. Soffer is a board-certified physician (American Board of Internal Medicine) licensed in Florida and New Jersey, prescribing at-home ketamine therapy through Tovani Health.
This page is general information about how this medication interacts with at-home ketamine therapy at Tovani Health. It is not a substitute for medical advice from your prescribing physician about your specific situation. Always discuss medication changes with the doctor who prescribed them.